COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Ying Cao,Xue Hu,Changqian Zhu,Shuangxi Zhou,Rui Li,Huilan Shi,Shiyu Miao,Mohammadtaghi Vakili,Wei Wang,Delin Qi
A key challenge in environmental remediation is the design of adsorbents with appropriate pore size and accessible sorption sites to achieve the rapid uptake and high capacity for the removal of their target pollutants. Covalent organic framework (COF) materials with adjustable pore size and designed skeleton structure are a new class of adsorbent materials for environmental remediation. Here, a novel COF was synthesized by a mild solvothermal solution-suspension method for efficient Pb (II) removal from aqueous solution. The prepared COF material displayed a typical lamellar structure , and the sulfhydryl groups on the COFs skeleton were confirmed to behave as active adsorption sites for Pb (II) capture. Sulfhydryl functionalized COF (COF-SH) reached adsorption equilibriums within 48 h and had a maximum adsorption capacity for Pb (II) of 239 mg/g based on Langmuir fitting. The adsorption capacity of COF-SH for Pb (II) removal is much higher than that of other conventional adsorbents, such as shell activated carbon and resin. Moreover, the selective adsorption performance of COF-SH to Pb (II) in the presence of coexisting heavy metal is superior, and its unique properties are derived from its soft sulfur-based chelating groups allowing selective capture of soft or relatively soft metal ions . The results presented here reveal the exceptional potential of COFs for high performance in environmental remediation.
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RSC Advances
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2020
·Vol. 10
·期 12
·7118-7124
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IF 3.119
Botian Li,Yichi Zhang,Bo Yan,Da Xiao,Xue Zhou,Junwei Dong,Qiong Zhou
In this work, an AIE luminogen-based hydrogel with temperature-responsive fluorescence was designed and synthesized. The polymeric hydrogel consisted of a supramolecular network through coordination and ionic interactions. When the temperature was decreased, due to the motion restriction of the polyacrylic acid macromolecular segments and the enhancement in ionic interaction, the hydrogel exhibited a blue-shift in the fluorescence emission peak and increase in the fluorescence intensity, resulting in the visualization of fluorescence changes. The hydrogel network benefitted from non-covalent crosslinking and thus possessed self-healing properties at room temperature with good toughness and resiliency. Therefore, this fluorescent supramolecular hydrogel might be used as a temperature-responsive material.
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CATALYSIS TODAY
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2020
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IF 5.825
Yang Yong,Gu Huajun,Zhang Qingxiao,Zhang Fang,Li Hui
In this paper, hollow Ni − P nanospheres (NSs) are prepared through Ni electroless plating on the Au-activated silica NSs externally covered by aminopropyl moieties, followed by removing the silica template with sodium hydroxide. With various characterizations, the resulting hollow Ni − P NSs are identified to be amorphous alloy. During liquid-phase hydrogenation of sugars to sugar alcohols, the hollow Ni − P amorphous alloy NSs delivered much superior catalytic performances to the commercial Raney Ni catalyst, showing a good potential in practical applications. Of particular interest is the unique hollow chamber structure of the hollow Ni − P amorphous alloy NSs, which allows for improving catalytic activity and durability relative to those associated with the dense Ni − P amorphous alloy NSs. This work demonstrated that such hollow Ni materials with nanoporous chamber structure displayed advantages such as easy experimental handling and high accessibility for the reactants in liquid-phase reaction, more Ni active sites, as well as the existence of more electron-enriched inner surface, which is essential to provide highly efficient catalysts for some reactions.
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Catalysis Science & Technology
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2020
·Vol. 10
·期 10
·3247-3254
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IF 5.721
Xinran Ding,Tao Yang,Wenxian Wei,Yihui Wang,Kai Xu,Zizheng Zhu,Hong Zhao,Tingting Yu,Dongen Zhang
Hydrogen has great promise as an energy carrier superior to traditional fossil fuels. Electrochemical water splitting is expected to be an effective and sustainable method for producing high-purity hydrogen fuel cleanly. The hydrogen evolution reaction (HER) is the cathodic reaction in the electrochemical water-splitting process and requires efficient catalysts. However, the state-of-the-art Pt suffers from high cost and rare reserves, which significantly limit its extensive applications in the hydrogen evolution reaction for water splitting. Although its catalytic activity still falls far short of expectations, molybdenum sulfide has emerged as one of the most promising catalysts for HER due to its abundant reserves and high tunability. Here, we have reported the synthesis and HER catalytic performance of a hybrid lanthanum sulfide/molybdenum sulfide (La2S3–MoS2) catalyst. The formation of molybdenum sulfide nanosheets in situ with lanthanum sulfide deposition was achieved through a facile one-pot solvothermal strategy. The present catalyst displayed much superior activity for HER to pristine and commercial molybdenum sulfide; low overpotentials of 205 mV, 277 mV, 336 mV and 455 mV for the current densities of 10 mA cm−2, 50 mA cm−2, 100 mA cm−2 and 200 mA cm−2 were obtained, respectively, together with a low Tafel slope of 51 mV dec−1. Moreover, the present catalyst exhibited excellent stability in long-term hydrogen evolution. The remarkable HER performance might be mainly due to the expanded interlayer distance and the nano-interfaces between the molybdenum sulfide and lanthanum sulfide segments, which induced an increased exposure of active sites and a modified surface electronic structure.
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Journal of Materials Chemistry C
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2020
·Vol. 8
·期 17
·5913-5922
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IF 7.059
Xiaoping Shen,Kangchen Nie,Li Zheng,Zhaosong Wang,Zhe Wang,Song Li,Chunde Jin,Qingfeng Sun
Taking inspiration from skeletal muscle with highly oriented myofibers, we developed a tough wood aerogel/poly(ionic liquid) (WA/PIL) hydrogel directly from wood via delignification, impregnation and gelation for the formation of a tactile sensor of electric double-layer capacitive configuration. The WA/PIL hydrogels integrated the representative properties of both wood and ionic liquids, being a promising candidate for both polyelectrolyte and separator materials. The influences of the wood texture and cross-linker (Bis) content on the mechanical and sensing performances of the hydrogels were investigated. The results showed that the tangential hydrogel slice with a 1.0 mol% Bis content (tan 1.0) displayed the most significant improvement in compressive stress (1.65 MPa) and deformation (73.3%) at fracture, suggesting the best compressibility. Electrodes also played a significant role in the sensitivity and stability of the sensor devices. While tan 1.0 with reduced graphene oxide (rGO) electrodes displayed the largest sensitivities (1.13–19.70 MPa−1), tan 1.0 with Ni foams possessed much more stable ionic signals within the whole stress range with sensitivities of 0.33–9.67 MPa−1. Due to the wide-stress-range responsiveness of our hydrogel sensor from gentle finger contact to vigorous hitting modes, it will find promising applications in various human–machine interfaces in the fields of electronics, recreation, sports, etc.
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ANALYTICA CHIMICA ACTA
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2020
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IF 5.977
Xiaoting Lian,Zibo Feng,Rong Tan,Xiaona Mi,Yifeng Tu
In this paper, a promising technology for obtaining an early indication and making a clinical diagnosis of coronary heart disease (CHD) is successfully designed. Specifically, label-free biosensors based on Au–Co nanoparticles (Au–Co NPs) were utilized to detect low-density lipoprotein (LDL) and oxidized low-density lipoprotein (ox-LDL), which are both CHD biomarkers. Conductive Au–Co NPs provided a prominent sensing platform and played the role of an efficient electrochemiluminescent (ECL) signaling amplifier. Conductive Au–Co NPs were fabricated using a simple method of water phase synthesis and were characterized using transmission electron microscope (TEM) and scanning electron microscope (SEM) images. An antibody was immobilized onto Au–Co NP-decorated indium tin oxide coated glass. After the formation of an immune complex between the antigen and antibody, using luminol as a sensing probe, it was found that the ECL signal was inhibited. Under the optimized conditions, the immunosensor exhibited sensitive detection of LDL over a wide linear range from 0.420 to 100 pg mL −1 with a detection limit of 0.256 pg mL −1 . Likewise, a linear regression of the concentration of ox-LDL was obtained over the range from 0.500 pg mL −1 to 60.0 pg mL −1 , with a detection limit of 0.330 pg mL −1 . This research provides a new method for making a clinical diagnosis and obtaining an early indication of CHD due to the high performance sensing of these two biomarkers.
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RSC Advances
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2020
·Vol. 10
·期 21
·12492-12503
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IF 3.119
Yanlong Sui,Lijie Qu,Xueyan Dai,Peihong Li,Jinrui Zhang,Shuai Luo,Chunling Zhang
Toxicity and environmental issues have elicited research attention regarding the need to prepare a green flame retardant with high flame retardancy. Here, a supermolecular self-assembly technology was used to prepare nickel phytate as shell materials aggregated on aminated silica nanotemplates through electrostatic interactions as a green novel flame retardant (Ni@SiO2-PA). After incorporating the obtained core–shell structured Ni@SiO2-PA into epoxy resin (EP), the supermolecular shell effectively enhanced the adhesive property between the nanoparticles and the EP matrix. The thermal stability was improved, and the peak heat release rate decreased significantly after introducing the well-characterized Ni@SiO2-PA. The absorbance intensity of the toxic aromatic compounds also decreased. Moreover, the char yield of the EP composites was improved because of the synergetic coupled effects between the nickel phytate supermolecules and SiO2 nanotemplates. The possible fire-retardancy mechanism was hypothesized as follows. The crosslinking structure of the silica initially enabled the formation of a polymer network to prevent further decomposition. The N–P synergistic flame-retardancy system then generated a gas barrier and P-rich intumescent char. Besides, char-residue generation was catalyzed by introducing Ni2+, which isolated the heat and the exchange between oxygen and the matrix. Overall, this study proposes a novel green flame retardant that may enable significant improvements in preparing environmentally friendly organic–inorganic materials with applications in the fields of flame-retardant composites.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Qianqian Ji,Lei Bi,Jintao Zhang,Haijie Cao,X.S. Zhao
Hollow perovskite oxide La 0·5 Sr 0·5 MnO 3 nanospheres are synthesized by using carbon spheres as template in the presence of citric acid . Among the samples investigated in this work, the one obtained at a sintering temperature of 700 °C exhibits the highest catalytic activity in the oxygen reduction reaction (ORR) in an alkaline electrolyte . The electrochemical measurement data shows that the sample has a positive onset potential (0.860 V) and a high limiting current density (6.48 mA cm −2 ). Furthermore, the catalyst shows a high selectivity towards methanol and a better stability than a commercial Pt/C catalyst. The hollow La 0·5 Sr 0·5 MnO 3 nanoshperes described in this manuscript hold a great promise for applications in metal-air batteries and alkaline fuel cells .
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2020
·Vol. 167
·期 6
·067501
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IF 3.721
Xiaoying Wang,Miao Gong,Linyu Li,Liangrui Lv,Xin Jin,Yijie Wang
An enzyme electrocatalytic p16 protein (AGp16INK4a) immunosensor based on polymethylene blue (PMB) decorated on functional composite modified glassy carbon electrode (PG-GR-CS/GCE) is constructed successfully. The PG-GR-CS having good conductivity and large specific surface area is composed of graphene (GR) doped polycaprolactam 6 (PA6) electrospun nanofibers (PG), GR and chitosan (CS), which could serve as a stable electropolymerization substrate for increasing the amount of PMB. The active catalytic electrode (PG-GR-CS-PMB/GCE) was used as the platform for the construction of an electrocatalytic immunosensor, it can greatly increase the immobilization capacity of AGp16INK4a capture antibody (Ab1), and further catch the AGp16INK4a and horseradish peroxidase-labeled detection antibody (HRP@Ab2) through the sandwich immunoreaction. The PMB decorated on PG-GR-CS/GCE exhibited good electron transfer and electrochemical properties, which could apply as electrocatalytically nanomaterials. Thus, the amplified electrocatalytic response were produced by the reduction of enzymatically oxidized PMB in the presence of hydrogen peroxide via HRP. It was observed that the change of the differential pulse voltammetry of the PMB was proportional to the AGp16INK4a ranging from of 1.0 pg ml−1 to 1.0 ng ml−1. The detection limit was down to 0.5 pg ml−1. The successful immunosensor provides a promising alternative to the electrocatalytic detection of various tumor markers.
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Catalysis Science & Technology
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2020
·Vol. 10
·期 9
·3015-3023
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IF 5.721
Shuyuan Wang,Dan Xu,Yunlei Chen,Song Zhou,Di Zhu,Xiaodong Wen,Yong Yang,Yongwang Li
Developing economically viable and highly selective hydrodeoxygenation (HDO) catalysts for the C–O bond cleavage of lignin-derived aryl ethers is very important, but still challenging. Herein, a novel monometallic Fe2P catalyst was synthesized by a two-stage phosphorization method under mild conditions, which showed a high arene (benzene) selectivity of 96.7% among C6+ products with a turnover frequency of 8.2 × 10−3 mol molCO−1 s−1 in the HDO of anisole at 200 °C and ambient hydrogen pressure. Characterization results revealed that the crystal structure of the Fe2P catalyst was stable and no phosphorus loss occurred in the reduction and reaction process. The kinetic results indicated that the coverage of anisole was higher than that of H2 on the Fe2P catalyst. The anisole temperature-programmed surface reaction (anisole-TPSR) and density functional theory (DFT) calculation results identified that the anisole HDO reaction mechanism is the direct cleavage of the Caryl–O bond of anisole to form and CH3O* without forming the C6H5–OH–CH3 intermediate. These findings may contribute toward understanding the iron-based phosphide and guiding the catalyst design for the HDO of aryl ethers and related reactions.
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ENERGY & FUELS
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2020
·
IF 3.421
Pan Li,Zeji Du,Chun Chang,Shiqiang Zhao,Guizhuan Xu,Chunbao Charles Xu
Artificial intelligence approach can be used to solve complicated process problems. A hybrid methodology comprising artificial neural network (ANN) and genetic algorithms (GA) was utilized to model and optimize the methanolysis process of waste peanut shells. Acid catalytic methanolysis of waste peanut shells into liquid biofuel-methyl levulinate (ML) was investigated. The combination of sulfuric acid with extremely low concentration and Al2(SO4)3 was identified as the efficient mixed acid catalytic system. The ML yield under optimal conditions optimized by response surface methodology (RSM) was 16.49%, while the ML yield optimized by ANN–GA was 17.61%. The results showed that ANN–GA had a higher optimizing ability than the RSM model. Meanwhile, the methanolysis kinetics provided insights into the reaction routes for ML production. Moreover, Al2(SO4)3 can be recycled and reused five times without much decrease of the ML yield. This study suggested that waste peanut shells can be used as potential raw materials for ML production and ANN–GA can serve as a powerful tool for biofuel processing technology.
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ORGANIC ELECTRONICS
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2020
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IF 3.31
Shuo Wang,Yu Zhu,Chengyan Wang,Ruixin Ma
Inverted perovskite solar cells with NiO x hole transport layer (HTL) have attracted abundant attention due to low-cost fabrication and high device-efficiency. However, the further development of NiO x -based inverted perovskite solar cells (PSCs) would be restricted by the unsatisfactory electrical properties in pristine NiO x and the non-ideal charge transfer between perovskite and NiO x . In this work, a facile and effective method was designed to regulate the electronic property of NiO x HTL and make an alteration to the interface between the perovskite and NiO x . NH 4 F was used as an interfacial modifier to enhance the charge transfer between the perovskite layer and NiOx. The NiO x -F layer was generated with high transmittance and low trap density . Besides, the power conversion efficiency of the device was improved from 17.17% to 18.94% with the improvement of short-circuit current (J sc ) by using the structure of ITO/NiO x /NH 4 F/MAPbI 3 /PCBM/BCP/Ag. Finally, the device with NH 4 F exhibited better stored stability in the dry condition compared with the control device.
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